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References: [ +from:w0ivj@tomthompson.com: 13 ]

Total 13 documents matching your query.

1. Re: [Amps] Class E amps (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Tue, 21 Oct 2014 15:15:02 -0600
I year or so ago, I built a Class E AM transmitter with a Class D pulse width modulator. The PA had a 94% efficiency and the modulator had a 90% efficiency. The modulator ran at 70 kHz. Both the modu
/archives//html/Amps/2014-10/msg00217.html (11,232 bytes)

2. Re: [Amps] The genius of ham radio (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Tue, 13 Jan 2015 08:21:23 -0700
The Ark was designed by the Ultimate Engineer. Tom W0IVJ The bulk of the chain mail is really quite irrelevant to the topic at hand--this line, however, speaks volumes, IMHO! Hi Hi Remember, the Ark
/archives//html/Amps/2015-01/msg00084.html (10,373 bytes)

3. Re: [Amps] RF tank voltage (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Sun, 29 Mar 2015 22:46:55 -0600
Use LTSpice. Tom W0IVJ 73s Eric - F1FLY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps _______________________
/archives//html/Amps/2015-03/msg00079.html (7,533 bytes)

4. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Wed, 01 Apr 2015 11:08:26 -0600
The flow through the radiator has to be the same as the flow around the tube. The secret is to spend more time in the radiator which has a larger surface area than the tube. Tom W0IVJ If you slow dow
/archives//html/Amps/2015-04/msg00008.html (11,815 bytes)

5. Re: [Amps] Ldmos heat spreaders (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 15 Aug 2016 08:06:25 -0600
Hi Ian, http://www.communication-concepts.com/heat-sinks/ 73, Tom W0IVJ I've only found up to 6mm think would this be okay ? Or could I get away with 2 layers to get 12 mm with heat transfer paste ?
/archives//html/Amps/2016-08/msg00017.html (7,655 bytes)

6. [Amps] conventional current flow (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 21 Nov 2016 10:21:58 -0700
When you click on the LIGO link Jim provided: https://www.ligo.caltech.edu/news/ligo20160211 be sure to watch the Ted Talk at: https://www.ligo.caltech.edu/video/LandryTed 73, Tom W0IVJ _____________
/archives//html/Amps/2016-11/msg00104.html (6,711 bytes)

7. Re: [Amps] MOSFET amp filtering - was: auto-tune (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 12 Dec 2016 20:03:42 -0700
Jim, /Lousy soil does NOT vary the vertical angle, it simply attenuates the signal. In the near field, it burns transmitter power by warming the worms. In the far field, it degrades ground wave and w
/archives//html/Amps/2016-12/msg00337.html (10,560 bytes)

8. Re: [Amps] MOSFET amp filtering - was: auto-tune (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 12 Dec 2016 23:23:29 -0700
Jim, I looked at your presentation and "take off angle" is not mentioned, but angle is. Granted the gain of a ground mounted vertical with radials has more gain as the ground becomes better, but I se
/archives//html/Amps/2016-12/msg00342.html (11,322 bytes)

9. Re: [Amps] Decline of homebrewing? (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Wed, 11 Jan 2017 10:51:23 -0700
This has been an interesting discussion. I have been working with my homebrew solid state amplifiers for years, and find that I have to take a completely different mind set when I work on tube equipm
/archives//html/Amps/2017-01/msg00229.html (8,398 bytes)

10. Re: [Amps] HV MOSFETs for RF (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 12 May 2017 12:20:28 -0600
I show how to construct a simple 40-dB, RF SAmpler that will easily handle 1500 watts. It is printed in the ARRL handbook under Construction Projects in the Test Equipment and Measurements section. T
/archives//html/Amps/2017-05/msg00121.html (13,374 bytes)

11. Re: [Amps] new amp race (RFI polarization) (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 22 May 2017 11:24:03 -0600
I have tracked down a lot of man made RFI (mostly from grow light ballasts) and without exception the signal is vertically polarized until you get very close to the source. I found this very interest
/archives//html/Amps/2017-05/msg00245.html (14,313 bytes)

12. Re: [Amps] new amp race (RFI polarization) (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Tue, 23 May 2017 23:17:45 -0600
Manfred, Stop for a moment. An end-fed antenna, and a battery-powered oscillator? Where did the other pole go??? You surely know as well as I do that current flows betwen two poles. An end-fed antenn
/archives//html/Amps/2017-05/msg00280.html (11,580 bytes)

13. [Amps] LDMOS availability (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 5 Jun 2017 09:18:34 -0600
I recently took part in a webinar on the new, 1800 watt, 65 volt, LDMOS transistors made by NXP. It is the MRFX1K80, and NXP plans to produce it for at least 15 years. Tom W0IVJ _____________________
/archives//html/Amps/2017-06/msg00041.html (6,755 bytes)

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